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Diffstat (limited to 'contrib/perl5/ext/DynaLoader/XSLoader_pm.PL')
| -rw-r--r-- | contrib/perl5/ext/DynaLoader/XSLoader_pm.PL | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/contrib/perl5/ext/DynaLoader/XSLoader_pm.PL b/contrib/perl5/ext/DynaLoader/XSLoader_pm.PL new file mode 100644 index 0000000..8cdfd63 --- /dev/null +++ b/contrib/perl5/ext/DynaLoader/XSLoader_pm.PL @@ -0,0 +1,158 @@ +use Config; + +sub to_string { + my ($value) = @_; + $value =~ s/\\/\\\\/g; + $value =~ s/'/\\'/g; + return "'$value'"; +} + +unlink "XSLoader.pm" if -f "XSLoader.pm"; +open OUT, ">XSLoader.pm" or die $!; +print OUT <<'EOT'; +# Generated from XSLoader.pm.PL (resolved %Config::Config value) + +package XSLoader; + +# And Gandalf said: 'Many folk like to know beforehand what is to +# be set on the table; but those who have laboured to prepare the +# feast like to keep their secret; for wonder makes the words of +# praise louder.' + +# (Quote from Tolkien sugested by Anno Siegel.) +# +# See pod text at end of file for documentation. +# See also ext/DynaLoader/README in source tree for other information. +# +# Tim.Bunce@ig.co.uk, August 1994 + +$VERSION = "0.01"; # avoid typo warning + +# enable debug/trace messages from DynaLoader perl code +# $dl_debug = $ENV{PERL_DL_DEBUG} || 0 unless defined $dl_debug; + +EOT + +print OUT ' my $dl_dlext = ', to_string($Config::Config{'dlext'}), ";\n" ; + +print OUT <<'EOT'; + +# No prizes for guessing why we don't say 'bootstrap DynaLoader;' here. +package DynaLoader; +boot_DynaLoader('DynaLoader') if defined(&boot_DynaLoader) && + !defined(&dl_load_file); +package XSLoader; + +1; # End of main code + +# The bootstrap function cannot be autoloaded (without complications) +# so we define it here: + +sub load { + package DynaLoader; + + my($module) = $_[0]; + + # work with static linking too + my $b = "$module\::bootstrap"; + goto &$b if defined &$b; + + goto retry unless $module and defined &dl_load_file; + + my @modparts = split(/::/,$module); + my $modfname = $modparts[-1]; + +EOT + +print OUT <<'EOT' if defined &DynaLoader::mod2fname; + # Some systems have restrictions on files names for DLL's etc. + # mod2fname returns appropriate file base name (typically truncated) + # It may also edit @modparts if required. + $modfname = &mod2fname(\@modparts) if defined &mod2fname; + +EOT + +print OUT <<'EOT'; + my $modpname = join('/',@modparts); + my $modlibname = (caller())[1]; + my $c = @modparts; + $modlibname =~ s,[\\/][^\\/]+$,, while $c--; # Q&D basename + my $file = "$modlibname/auto/$modpname/$modfname.$dl_dlext"; + +# print STDERR "XSLoader::load for $module ($file)\n" if $dl_debug; + + my $bs = $file; + $bs =~ s/(\.\w+)?(;\d*)?$/\.bs/; # look for .bs 'beside' the library + + goto retry if not -f $file or -s $bs; + + my $bootname = "boot_$module"; + $bootname =~ s/\W/_/g; + @dl_require_symbols = ($bootname); + + # Many dynamic extension loading problems will appear to come from + # this section of code: XYZ failed at line 123 of DynaLoader.pm. + # Often these errors are actually occurring in the initialisation + # C code of the extension XS file. Perl reports the error as being + # in this perl code simply because this was the last perl code + # it executed. + + my $libref = dl_load_file($file, 0) or do { + require Carp; + Carp::croak("Can't load '$file' for module $module: " . dl_error()); + }; + push(@dl_librefs,$libref); # record loaded object + + my @unresolved = dl_undef_symbols(); + if (@unresolved) { + require Carp; + Carp::carp("Undefined symbols present after loading $file: @unresolved\n"); + } + + my $boot_symbol_ref = dl_find_symbol($libref, $bootname) or do { + require Carp; + Carp::croak("Can't find '$bootname' symbol in $file\n"); + }; + + my $xs = dl_install_xsub("${module}::bootstrap", $boot_symbol_ref, $file); + + push(@dl_modules, $module); # record loaded module + + # See comment block above + return &$xs(@_); + + retry: + require DynaLoader; + goto &DynaLoader::bootstrap_inherit; +} + +__END__ + +=head1 NAME + +XSLoader - Dynamically load C libraries into Perl code + +=head1 SYNOPSIS + + package YourPackage; + use XSLoader; + + XSLoader::load 'YourPackage', @args; + +=head1 DESCRIPTION + +This module defines a standard I<simplified> interface to the dynamic +linking mechanisms available on many platforms. Its primary purpose is +to implement cheap automatic dynamic loading of Perl modules. + +For more complicated interface see L<DynaLoader>. + +=head1 AUTHOR + +Ilya Zakharevich: extraction from DynaLoader. + +=cut +EOT + +close OUT or die $!; + |
